It should be noted, however, that both a thinner gasket and the smooth finish, in and of themselves, require a higher compressive force (i.e. Our parts are of high-quality at low prices. Required fields are marked *. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. Comparator gauge is used to check serration of the flange. The most widely used of any flange surface finish, because practically, is suitable for all ordinary service conditions. These fantastic, yet often-unnoticed components add strength and durability to machined parts. Sometimes AARH is referred also as Ra which stands for Roughness Average and means the same. You can order a cutter with customized pitch dimensions which includes the angle and the size of cutters. Thickness should also be factored in when measuring flanges. To accomplish this security, you must first properly measure your flange. In the image, you can see the how gauge is used to verify the value of serration. DIN 6927 Top Lock Class 10. This will be an acceptable way if you are replacing an existing piece in your system. Machining of gasket faces of flanges to a smooth finish of Ra = 3.2 - 6.3 micrometer For sizes 14 inch and larger, the finish is made with 3.2 mm round-nosed tool at a feed of 1.2 mm per revolution. If you mention flange facing machines to an on-site machinist, the chances are the first manufacturer they’ll think of is Mirage. Nylon Insert. It is used to measure the roughness (rather smoothness) of surfaces. The resultant surface finish has a 500 microinch (12.5 ㎛) approximate roughness. (= 125 - 250 microinches AARH). The tool would need a 0.060" radius with a 0.015 DOC. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. Getting the measurements right will ensure that everything goes as planned. A critical and fundamental aspect of sealing is the of friction between the flange and gasket surfaces. Flange Nuts (No Serrations) Center Lock Grade F, Steel Zinc. DIN 6923 Hex Flange; Flange … Many flanges will be used in machinery that generates significant pressure and heat. Step 3 – Finally, measure around the outside diameter of the flange. 250-500 AARH (it is called stock finish) is specified for soft gaskets such as NON Asbestos, Graphite sheets, Elastomers etc. Copyright ©2015 World Wide Metric, Inc. - All Rights Reserved. Make sure to check out our Quick Reference Flange Chart for guidance. Bolt circle diameter (B.C.) This finish shows no visually apparent tool markings. High standards are maintained throughout the production process to make the cutters durable and efficient. However, always be sure you only go up in pressure. or larger radius. Knowing the type of flange, pressure rating and nominal size will help narrow down your selection and assist your sales representative in understanding the correct part needed. Measurement System: Inch Part Number: 0000-111883 Size: 1/4"-20 x 1" (FT) Specification Met: Grade: 5 Style: Hex Flange Screw with Serration, 1" Long Thread Coverage: Full Thread Pitch: 20 inches Thread Size: 1/4"-20 Thread Type: Coarse UNSPSC Code: 31161620 Concentric Serrated In the image, you can see the how gauge is used to verify the value of serration. Top-Lock Hex Flange Grade-G. Flange Nuts. This can be accomplished by measuring from the outside edge of the flange to the opposite outer edge. A concentric or spiral serrated finish with 30 to 55 groves per inch and a surface roughness between 125 and 500 microinches. A 90° tool is used and the serrations are spaced evenly across the face. Specifically, it shows how to assess damaged portions of a flange face by taking measurements of the defective areas (see Figure 1 in Appendix to Article – Flange Face Inspection Criteria). Now the measurement value of Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height). The Panama Canal Readies for Cruise Season, Sailing Out of a Slump with Eco-Friendly Offerings, Metrification and the United States – A Brief History, WP-Backgrounds Lite by InoPlugs Web Design. Phonographic serrations are allowed. You may have probably seen this comment: This will help guide you to the center. Accurate measurement also relies on understanding pressure ratings. “Sealing Sense” in the April 2008 Pumps & Systems discussed the importance of ensuring that the choice of gasket and surface finish work together to maintain the appropriate level of sealing stress on the gasket. DIN 6923. Coating helps to increase abrasion resistance and therefore increase the lifespan of the cutter. See, for example Table 20 note (1). What Makes Wouter Witzel Butterfly Valves a Superior Choice? Serrated-Flange Hex Head Screws About 20% stronger than medium-strength steel screws, these Grade 8 steel screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. Pressure, of course, is the number one cause of flange failure. Choose from our selection of serrated-flange bolts, including over 325 products in a wide range of styles and sizes. Understanding how to find the right flange for your project should never be overlooked. Smooth finishes are usually found on machinery or flanged joints other than pipe flanges. Read about company. Precicheck India - Offering Serration Gauge, Precision Gages, प्रेसिजन गेज, Plain Gauge in Industrial Area Phase 7, Mohali, Punjab. This is also a continuous or phonographic spiral groove, but it differs from the stock finish in that the groove typically is generated using a 90-° tool which creates a "V" geometry with 45° angled serration. Smooth finish flanges are more common for low pressure and/or large diameter pipelines and primarily intended for use with solid metal or spiral wound gaskets. A serrated finish, either concentric or spiral, is required with 30 to 55 grooves per inch and a resultant roughness between 125 and 500 micro inches. Serration of flange face is specified in RMS (Root Mean Square) or AARH (Arithmetic Average Rough Height), the most common value of serrated face is 120-250 AARH. The most used Surfaces Reply: No, provided all the requirements of ASME B16.5-2003 are met. JR digger doug liked this post 03-13-2014, 08:07 AM #4. gbent. 125-250 AARH (it is called smooth finish) is specified for Spiral Wound Gaskets. ASMC Industrial offers a comprehensive selection of industrial, automotive, and construction fasteners. flange face by taking measurements of the defective areas (see Figure 1). AARH stands for Arithmetic Average Roughness Height. This is why Anvil is a trusted, go-to source for all industrial, mechanical, fire protection, and oil & gas piping systems. This will result in a roughness between Ra 3.2 and 6.3 micrometers (125 - 250 micro inch). is one of the most important factors to consider. Measurement System: Inch Part Number: 0000-110645 Size: 1/4"-20 x 5/8" (FT) Specification Met: Grade: 5 Style: Hex Flange Screw with Serration, 5/8" Long Thread Coverage: Full Thread Pitch: 20 inches Thread Size: 1/4"-20 Thread Type: Coarse UNSPSC Code: 31161620 Your email address will not be published. The flange face is the surface area that hosts the gasket. Spiral Serrated Spline & Serration Gauges. Limits are established by determining the effective length (in the radial direction) and matching it to the depth Comparator gauge is used to check serration of the flange. For more than 165 years, Anvil International has provided quality products combined with the latest technology, industry expertise, and superior customer service. Determining the right process for measuring flanges can often come down to using a simple chart. To prevent failure from heat and pressure, a part’s pressure rating needs to be taken into account. 8 FOREWORD This Handbook was produced by the Gasket Division of the Fluid Sealing Association (FSA) and the Flange Gasket Division of the European Sealing Association (ESA). The ASME B16.5 code requires that the flange face (raised face and flat face) has a specific roughness to ensure that this surface be compatible with the gasket and provide a high quality seal. For example, a flange that’s rated a PN40, 40K or 600 lbs will be able to withstand more pressure and excessive heat more so than a flange that has a lower pressure rating. Under compression, the soft face from a gasket will embed into this finish, which helps create a seal, and a high level of friction is generated between the mating surfaces. Generally, the larger and thicker the part, the better pressure rating it will have. Step 2 – Measure across the center of the flange. As the name suggests, this finish is comprised of concentric grooves. Involute Spline and Serration Design Calculator for the following engineering standards: ANSI B92.1-1970, ANSI B92.1-1996, ASA B5.15-1960, SAE STANDARD - … This success stems from their precision construction, the results they deliver, and how easy they are to set-up. … Thickness should also be factored in when measuring flanges. Gr-G Stover®-Equivalent. Choose from external and internal mount options in … 1.serration inspection is based on comparative method for the serration (using comparator) 2.if possible the width of the flange as per 16.5 permit some tolerance if its extra you make machining for raised face (mim 1.6 -2 mm)with respect to flange face. Next, measure the inside diameter of your flange. Subject: B16.5-2003; Machining a WN flange to a SW flange Date Issued: June 19, 2006 Record: 05-1355 Question: Does ASME B16.5-2003 prohibit a flange manufacturer from converting a welding neck flange to a socket welding flange? The finish for these flanges is generated by a 1.6 mm radius round-nosed tool at a feed rate of 0.8 mm per revolution up to 12 inch. The tool used to imprint a rough finish on the flange should have a radius of 0.06 inch (1.5mm) or larger. Bolt circle diameter is the measure from the center of a bolt hole to the center of the hole on the opposite side. Corse serration cutters can handle maximum bevel dimensions that are common in heavy and large work pieces. to drawing Pressure Classes Flanges make it possible for parts to be attached to other surfaces securely. When working with a smooth finish, it is important to consider using a thinner gasket to lessen the effects of creep and cold flow.